Japanese Ambassador to China Uichiro Niwa on Sunday left Beijing for Tokyo to discuss the latest developments in bilateral relations with Foreign Minister Koichiro Gemba, including intrusions by Chinese vessels into Japanese waters near the disputed Senkaku Islands in the East China Sea. \"I will go (to Tokyo) to report the situation\" including the intrusions, which occurred Wednesday and Thursday, Niwa told reporters at Beijing Capital International Airport. Asked when he will return to Beijing, Niwa said, \"Not decided yet. But I think I will have to return after finishing talks (in Tokyo).\"